David Erwin Larson (born June 25, 1959) is an American former competition swimmer who is an Olympic gold medalist and former world record-holder. Larson is a Georgia native who became an All-American college swimmer for the University of Florida. He was known for his success as a member of American relay teams in international competition at the Pan American Games and the Olympics – and for setting two world records in the 4×200-meter relay event on the same day at the 1984 Olympics.